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  1. #81
    Super Moderator curious aardvark's Avatar
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    to be fair I run all the controls from simplify3d, and since I removed the usb cable extender, I stopped having connection issues.
    The only thing I use the onboard control panel for is running a print from the sd card.
    To be fair, it is the only thing you can practically use it for.

    If I could flash it, then marlin is the absolute last thing I would use.
    It is my only marlin printer and the only one where the firmware isn't worth the silicon it's written into.
    In what universe do you make a 3d printer firmware that won't even load filament from the control panel ?

    The other 4 firmwares are all excellent, and all different :-)

    Right, so remove the caps and let the screws wobble, but keep the couplers.

    And yes, I think the extruder assembly can be wobbled by hand.

    I'll have to see why.

  2. #82
    Super Moderator curious aardvark's Avatar
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    After some judicious wobbling I have found the problem !
    The bearings that run up and down the smooth guide rods are simply clipped into the plastric assembly.
    There is nothing holding them steady and they rock in the sockets. Presumably they should have been secured by cable ties.

    So It looks like I'll need to remove the extruder assembly again and wither drill some holes for cable ties, or glue the buggers in.

    Autowhiz, I noted you'd 3d printed your parts - got the stls anywhere ?

  3. #83
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    What would you like? I have gone back a few pages and seen your z bearings do not look secured to the plastic. They are a different style than what I am using. If you look at the picture of mine on the last page you will see I have a bolt that goes through my plastic to hold them bearings tight in place. Those are official Geeetech X carriage parts downloaded and printed from thingiverse. I have them on my home made printer also. But because that frame mounts the z rods too close to the frame I had to mirror the images before slicing and then mount the x carriage backwards so those ends would fit on my frame..

  4. #84
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    Also you should note the orientation of the filament spool. The other way is functional but far from preferable. And as you reach the top of your build height you might end up breaking some filaments. Which just blows at the end of a really long print that would see the max build height achieved. I have had such great results from each and every time I applied a second motor to an axis that I am thinking now about a printer with no idler pulleys. 2 stepper motors on opposing ends of each axis. This printer will use 7 stepper motors and 7 stepper motors drivers for 1 extruder. I think 10 if we want to use the MMU2.0 stuff which I very much do. Can you imagine a printer with 10 stepper drivers? Sounds far fetched, doesn't it? I think i'm gonna do it. For this effort I will just print another motor end for the x axis and replace the idler end with it. This is such an incredible hobby because there is so much freedom to just be creative here.

  5. #85
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    Here is the thingiverse with the printed parts from geeetech for the i3. you can mirror them print them how you like put the motor on whichever side you like facing whichever way you like. These parts take a bolt and even without the bolt they hold the bearing all the way around: https://www.thingiverse.com/thing:989245/files

  6. #86
    Super Moderator curious aardvark's Avatar
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    cheers - frame looks identical - so the parts should fit.

    I can see what you mean about the orientation of the filament spool. that's a fairly easy fix, but can wait for the moment.

    Although if it were printing to height, then there wouldn't be an issue. At the moment I tend to put the z axis at the top at the end of a print and that does give a long length, but if it were printing and going up slowly, there wouldn't be a problem. Plus I'd need to move the screen - which I can't be arsed to do :-)

    um, 7 - 10 stepper motors for a single extruder i3 ?
    why ?
    Okay, re-read the post. So a motor at each end of a belt. What benefits would that give ?
    If the motor weren't perfectly in sync it would cause more hassle that you might save. You'd need to make sure that all the wires to the paired motors were identical lengths. Okay electricity passes pretty quickly through wire, but it's a measurable speed and you don't need much difference to effect a print.
    I guess if you had a very large printer, it would reduce strain on the belts and pulleys - but can't see any other reason.
    Last edited by curious aardvark; 07-12-2019 at 06:17 AM.

  7. #87
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    counting equal steps to 2 motors has been perfected since the first i3 printer came about. This is no problem. The benefits of this conversion will be speed and strength without artifacts in the print from heavy axes being slung back and forth, to and froe. It is the difference between pushing or pulling depending on which way you are going vs. pushing AND pulling in each direction. I ran 2 motors for my Y axis on my Black Widow printer with the big heavy 400x250 heatbed with 3mm borosilicate glass plate. It works amazing. no more skipped steps and I was able to raise the print speed as well. 2 motors on an axis directly translates into 2x holding torque on that axis.

    Another great place for this conversion would be if you had a 12v printer and wanted to run the silent drivers in stealthchop. a second motor and driver on a given axis would go a long way towards correcting for the lost holding torque.

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